Download MAGIQ Overview - Caltech Optical Observatories

WBS 3.3 Laser Facility
Jim Bell, Jason Chin, Erik Johansson, Chris Neyman, Viswa Velur
Design Meeting (Team meeting #11)
November 05, 2007
Agenda
• Discussions at CfAO retreat on Sodium Return
• Feasibility of SOR and LMCTI lasers
• Other progress
2
Sodium Returns
• Sodium Return
– Discussions at CfAO shows there are still large uncertainties in
determining sodium returns.
– The best data we have currently comes from the SOR and the
Gemini North System.
– Circular polarization factor is diminished by Mauna Kea’s latitude
as compared to SOR. The 2x factor may be closer to that of
GN’s 1.3.
– SOR’s next generation dual frequency pump laser of D2a and
D2b will increase return by a factor of 1.6.
3
Laser Architectures
•
Stable Laser Platform (SLP)
– Laser is on or below the
Nasmyth Platform.
– No dependency on a moving
gravity vector.
– More complex laser beam
transport system, use of
Location 1
(behind HIRES)
fibers, likely more
Existing HIRES
throughput losses.
Instrument
•
Laser Launch Telescope
Location
Locations III
on side of Elevation R
AO Enclosure/
Electronics Vault
Moving Laser Platform (MLP)
– Laser is on the elevation
ring.
– Dependency on a moving
gravity vector.
– Added complexity for
installation on the elevation
ring.
– Improved throughput.
FRONT VIEW
4
What’s happening at SOR?
•
Current AFRL plans
– In process of fabricating a new and improved SOR unit.
– New SOR system is expected to see improvements in power, 50%.
– Redesign of optical bench to include modular design. Modular design of
amplifiers will provide additional stability and simplicity. Reduce size of optical
bench; but likely increase due to double pumping.
• Improvement in the NPRO engine for higher output.
• Removal of OTS units for better stability.
• No plans for a gravity moving vector system; but expects the new redesigns and
modules to be able to handle a changing gravity vector.
• Improvement to stability using hallowed out machined mechanical blocks.
– Second system for Maui will be more similar to the existing system than new
system. SOR will used 14 existing NPRO engines.
• Funding of the Maui System is not concrete. A laser is expected as part of the new AO
system at for Maui.
• Maui system will not have a changing gravity vector; although optical bench is vertical.
– AFRL currently moving forward with design of new SOR system.
5
SOR Feasibility
• Using SOR’s system with a MLP architecture.
– High power supplies in thermal enclosure on the Nasmyth Platform.
– Large gauge low voltage high current power cables from Nas Platform
to elevation ring (200 ft maximum).
– Elevation ring will include two 3’x8’ thermally controlled optical benches
and electronics controller. Size of this enclosure will be similar to the K2
laser enclosure on the telescope.
– Sealed systems for condensation considerations; No need for clean
room.
– Will require 16KW to 20KW for power and heat removal.
• AFRL expects to complete the SOR and Maui system by 2010.
• Fits into NGAO’s timeline for procurement of laser in 2010.
• Possible collaboration effort
6
LMCTI Feasibility
• LMCTI is focused on finishing GSK lasers.
• Discussions suggest some minor reduction in size of the current
system; but not likely to be significantly different without additional
funding.
• System architecture will be similar to K1 using the SLP architecture.
• Will require large enclosure on or below Nasmyth Platform to house
multiple laser benches and electronics racks.
7
The ‘F’ Factor
• Fiber Lasers
– ESO is developing fiber laser internally and externally with manufacturer
(Volius in Moscow). 4 lasers to be installed on the VLT.
– Currently 5+Watts. Expects power to double by Jan 08.
– Once power levels are met, technology will be transferred to
engineering company in Europe.
– Product will be available to all.
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WBS 3.3 Laser
•
Progress
– Draft Laser Architecture Report on Twiki. Needs update with recent CfAO
discussions.
– Laser Enclosure Requirements Updated
– Laser Requirements Upated.
– Block Diagram for laser control system updated. Start specifying the
blocks and interfaces.
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